package com.corner.utils.imageloader.walker;

import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.os.Handler;
import android.text.TextUtils;

import com.amap.api.maps2d.AMap;
import com.amap.api.maps2d.model.BitmapDescriptor;
import com.amap.api.maps2d.model.BitmapDescriptorFactory;
import com.amap.api.maps2d.model.LatLng;
import com.amap.api.maps2d.model.Marker;
import com.amap.api.maps2d.model.MarkerOptions;
import com.corner.R;
import com.corner.model.cornerservice.domain.Info;
import com.corner.utils.BitmapUtil;
import com.corner.utils.imageloader.FileCache;
import com.corner.utils.imageloader.MemoryCache;
import com.corner.utils.imageloader.Utils;

import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.net.HttpURLConnection;
import java.net.URL;
import java.util.List;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;

public class MapImageLoader {
    public static final String INFO_HAS_CODE = "infoHasCode";
    // 当进入listview时默认的图片，可换成你自己的默认图片
    final int stubBitmapRes = R.drawable.common_avatar;
    Context context;
    MemoryCache memoryCache = MemoryCache.getInstance();
    FileCache fileCache;
    //	private Map<ImageView, String> imageViews = Collections
//			.synchronizedMap(new WeakHashMap<ImageView, String>());
    ExecutorService executorService;
    Handler handler = new Handler();// handler to display images in UI thread

    public MapImageLoader(Context context) {
        this.context = context;
        fileCache = new FileCache(context);
        executorService = Executors.newFixedThreadPool(5);
    }

    public void displayImage(LatLng point, String url, AMap map, List<Marker> markers, Info info) {
        if (TextUtils.isEmpty(url)) {
            Bitmap bitmap = memoryCache.get(String.valueOf(stubBitmapRes));
            if (bitmap == null) {
                bitmap = BitmapFactory.decodeResource(context.getResources(), stubBitmapRes);
                memoryCache.put(String.valueOf(stubBitmapRes), bitmap);
            }
            display(point, map, bitmap, markers, info);
            return;
        }
        Bitmap bitmap = memoryCache.get(url);
        if (bitmap != null) {
            display(point, map, bitmap, markers, info);
        } else {
            // 若没有的话则开启新线程加载图片
            queuePhoto(url, point, map, markers, info);
            // imageView.setImageResource(stub_id);
        }
    }

    private void display(LatLng point, AMap map, Bitmap bitmap, List<Marker> markers, Info info) {
        // 构建Marker图标
        BitmapDescriptor bitmapD = BitmapDescriptorFactory.fromBitmap(bitmap);
        // 构建MarkerOption，用于在地图上添加Marker
        MarkerOptions markerOptions = new MarkerOptions();
        markerOptions.position(point);
        markerOptions.icon(bitmapD);
        // 在地图上添加Marker，并显示

        Marker marker = map.addMarker(markerOptions);
        marker.setObject(info.getObjectId());
        markers.add(marker);
    }

    private void queuePhoto(String url, LatLng point, AMap map, List<Marker> markers, Info info) {
        PhotoToLoad p = new PhotoToLoad(url, point, map, markers, info);
        executorService.submit(new PhotosLoader(p));
    }

    private Bitmap getBitmap(String url) {
        File f = fileCache.getFile(url);
        /**
         * 先从文件缓存中查找是否有
         */
        // from SD cache
        Bitmap b = decodeFile(f);
        if (b != null)
            return b;
        /**
         * 最后从指定的url中下载图片
         */
        // from web
        try {
            Bitmap bitmap = null;
            URL imageUrl = new URL(url);
            HttpURLConnection conn = (HttpURLConnection) imageUrl
                    .openConnection();
            conn.setConnectTimeout(30000);
            conn.setReadTimeout(30000);
            conn.setInstanceFollowRedirects(true);
            InputStream is = conn.getInputStream();
            OutputStream os = new FileOutputStream(f);
            Utils.CopyStream(is, os);
            os.close();
            conn.disconnect();
            bitmap = decodeFile(f);
            return bitmap;
        } catch (Throwable ex) {
            ex.printStackTrace();
            if (ex instanceof OutOfMemoryError)
                memoryCache.clear();
            return null;
        }
    }

    /**
     * decode这个图片并且按比例缩放以减少内存消耗，虚拟机对每张图片的缓存大小也是有限制的
     */
    // decodes image and scales it to reduce memory consumption
    private Bitmap decodeFile(File f) {
        try {
            // decode image size
            BitmapFactory.Options o = new BitmapFactory.Options();
            o.inJustDecodeBounds = true;
            FileInputStream stream1 = new FileInputStream(f);
            BitmapFactory.decodeStream(stream1, null, o);
            stream1.close();

            // Find the correct scale value. It should be the power of 2.
            final int REQUIRED_SIZE = context.getResources().getDimensionPixelSize(R.dimen.dimen_avater_width_height);
            int width_tmp = o.outWidth, height_tmp = o.outHeight;
            int scale = 1;
            while (true) {
                if (width_tmp / 2 < REQUIRED_SIZE
                        || height_tmp / 2 < REQUIRED_SIZE)
                    break;
                width_tmp /= 2;
                height_tmp /= 2;
                scale *= 2;
            }

            // decode with inSampleSize
            BitmapFactory.Options o2 = new BitmapFactory.Options();
            o2.inSampleSize = scale - 1;
            FileInputStream stream2 = new FileInputStream(f);
            Bitmap bitmap = BitmapFactory.decodeStream(stream2, null, o2);
            Bitmap newBm = Bitmap.createScaledBitmap(bitmap, REQUIRED_SIZE, REQUIRED_SIZE, false);
            bitmap.recycle();
            bitmap = null;
            stream2.close();
            return newBm;
        } catch (FileNotFoundException e) {
        } catch (IOException e) {
            e.printStackTrace();
        }
        return null;
    }

    public void clearCache() {
        memoryCache.clear();
        fileCache.clear();
    }

    // Task for the queue
    private class PhotoToLoad {
        public String url;
        public LatLng point;
        private AMap map;
        private List<Marker> markers;
        private Info info;

        public PhotoToLoad(String u, LatLng i, AMap map, List<Marker> markers, Info info) {
            url = u;
            point = i;
            this.map = map;
            this.markers = markers;
            this.info = info;
        }
    }

    class PhotosLoader implements Runnable {
        PhotoToLoad photoToLoad;

        PhotosLoader(PhotoToLoad photoToLoad) {
            this.photoToLoad = photoToLoad;
        }

        @Override
        public void run() {
            try {
                Bitmap bitmap = getBitmap(photoToLoad.url);
                Bitmap bmp = BitmapUtil.getRoundedBitmap(bitmap);
                bitmap.recycle();
                bitmap = null;
                memoryCache.put(photoToLoad.url, bmp);
                BitmapDisplayer bd = new BitmapDisplayer(bmp, photoToLoad);
                handler.post(bd);
            } catch (Throwable th) {
                th.printStackTrace();
            }
        }
    }

    /**
     * 用于在UI线程中更新界面
     */
    // Used to display bitmap in the UI thread
    class BitmapDisplayer implements Runnable {
        Bitmap bitmap;
        PhotoToLoad photoToLoad;

        public BitmapDisplayer(Bitmap b, PhotoToLoad p) {
            bitmap = b;
            photoToLoad = p;
        }

        public void run() {
            if (bitmap != null)
                display(photoToLoad.point, photoToLoad.map, bitmap, photoToLoad.markers, photoToLoad.info);
        }
    }

}
